CI: add whitespace checker

Fix issues detected.

Also:

- One of the `.vc` files used LF EOLs, while the other didn't.
Make that one also use LF EOLs, as this is appare

CI: add whitespace checker

Fix issues detected.

Also:

- One of the `.vc` files used LF EOLs, while the other didn't.
Make that one also use LF EOLs, as this is apparently supported by
`nmake`.

- Drop `.dsw` and `.btn` types from `.gitattributes`.
The repository doesn't use them.

- Sync section order with the rest of files in
`tests/certs/EdelCurlRoot-ca.prm`.

- Indent/align `.prm` and `.pem` files.

- Delete dummy `[something]` section from `.prm` and `.pem` files.

Mental note:
MSVC `.sln` files seem to accept spaces for indentation and also support
LF line-endings. I cannot test this and I don't know what's more
convenient when updating them, so left them as-is, with specific
exclusions.

Closes #14031

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tool: determine the correct fopen option for -D

This commit fixes a bug in the dump-header feature regarding the
determination of the second fopen(3) option.

Reported-by: u20221

tool: determine the correct fopen option for -D

This commit fixes a bug in the dump-header feature regarding the
determination of the second fopen(3) option.

Reported-by: u20221022 on github

See #4753
See #4762
Fixes #10074
Closes #10079

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